STS045-77-78
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Spacecraft nadir point: 2.4° N, 57.1° W

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Spacecraft Altitude: 159 nautical miles (294km)
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Image Caption:
STS045-77-078: Dry polar air moving off the Alaskan continental
mass over the Gulf of Alaska Air rapidly absorbs water vapor from
surface waters which produces streets of cumulus clouds. These
cloud streets demonstrate vigorous vertical motion in the atmo-
sphere. This kind of vertical motion is assumed to be charac-
teristic of the tropics only.

STS045-85-024 and STS045-77-078: Low-level Polar Atmospheric
Phenomena STS045-85-024 shows a combination of von Karman eddies
and Kelvin waves. The von Karman eddies are three small circular
features created by boundary layer winds flowing past obstacles
(in this case some of the Aleutian Islands). Capping by a strong
inversion and a saturated atmosphere are requirements for the
development of visible von Karman eddies. Kelvin waves (fish-
wake feature in corner of frame) are curved, more linear features
than the circular von Karman eddies. They indicate regions where
the capping inversion is less strong.